Concrete-mixer.



M. E, E1 CONCRETE MIXER APPLICATION mum 51131912221, 1 30a.

mmmea June 6, 1911.

2 SEE M. H. REED CONCRETE-MIXER.

APPLICATION FILED SEPT. 28,1908. 994,536, I Patented June 6,1911.

2 SHEETSSHEIIT 2 [Witness-0.5.- r mew UNITED STATES PATENT OFFICE.

MATTHEW HOWARD REED, OF PITTSBURG, PENNSYLVANIA.

Specification of Letters Patent.

Patented June 6, 1911.

Application filed September 28. 1908. Serial No. 455,101.

To all whom it may concern. 7 I

Beit known that I, Marrnmw lldwxnn Reno, a citizen of the United States, {residing at Iittsburg, in the county of Allegheny and State of Pennsylvania, have invented certaiir new and useful Improve ments in Concrete-Mixers, of whic the following is a specification, reference being had therein to the accompanying (llilWlllg.

lVIy invention refers to improvements in concrete mixers, for mechanically mixing concrete composed of the usual ingredients, crushed stone, sandgcemcnt and water, and it has for its object t-o'provide a construction wherein the concrete may be't-horoughly mixed by the rotation of a cylindrical drum provided with angularly arranged blades, means for receiving the ingredients at the lowermost portion of the front end, means for deliver-mg theingredients into the interior and for n'cventing their return backwardly, means for discharging the mixed product from time to time as made, together -with-other features of coi'ist-ruction-as shall be more fully hereinafter set forth.

i The particular object of the invention is to provide an apparatus'into which the ingredients. may be charged at the lowerliiost ortion so as to avoid the necessity of wheelin hr hoisting thereinto from preliminary hoisting platformsor by other hoisting eans ,:as is usually necessary in devices of this class. -In the drawings which show preferred forms of the ap aratus; Figure 1 is a central longitudina sectional view in normal position. Fig 2 is an end view in eleva- -,tion from the front or receiving end.- Fig.

similar view from the rear or discharging end. 'Fig. 4 is a vertical sectional view on the broken'l'ine IV. IV. of Fig. 3,.but showing the 'd'iscl' arge gate open. Fig. 4" is asimilzir view on theline IV. IV. of Fig.

showing the gateoperating mechanism in en position. Fig; 5 is a horizontal sec-- tionaldetail view on the lineV.'-V. of Fig. 2. .Fig: 6 is a detail view detached of a portion of the transverse mg one of the se nentz l open-ingsth'erein for-dischargeof t e material. Figs. 7 and 8' are front and vertical sectional views respectively, showing modified constructions embodying combinedcharging and protecting or mixing fades. Figs. 9 and 10 are siinilar views showing afurther modified arrangeincntof the'parts and a laterally enpartition, show .ing or other suitablenieans. protecting blades similarly secured to part1- tion 7 under the o :)pos1tes1de-of the opeiv larged annular receiving pocket for the material.

In the drawings 2- is the mixer drum or shell provided at its front end with an arinular inwardly extending flange 3 forniing its front end and having a central receiving opening concentric with the outer larger diameter of the drum, and constituting a front retaining wall, providing an annular pocket, for receiving the ingredients or material to be mixed. 4 a charging chute or rest of suitable form extending from the edge of said flange 3 at its lowermost portion, and adapted to receive the material as discharged thereinto and to convey it into said pocket, from'any suitable conveying apparatus as a barrow, supported on platform 5, incorporated with the general structure. As will be observed the platform 5 is substantially on a level with-the lower edge of the drum, a particular advantage of the invention being that the drum may thus be mounted only sufficiently above the ground level to provide for the necessary framing, thus greatly facilitating the access to the machine by the operator supplying the ingredients The other end of the drum is closed by a head 6., preferably extending entirely across the area except where open to provide for outlet of the mixed material, as controlled by the outlet gates, hereinafter described.

Extending transversely across the area of the mixer drum near to and somewhat. back from its front end, and forming if desircd the rear wall of the receiving pocket referred to, is a partition. 7, preferably prolion of the interior, although said opening may be dispensed with if' desired. Said partition 7, in the construction shown, is provided with a plurality of radial-openings 9 of segmental or other suitable form as clearly shown. in Fig. 6, through which the ingredients are discharged inwardly by the dii'ecti11g ,-hl'a(le to the mixing interior. .10

"outwaii'dly from sa. l partition, radially of agdchzirging magic extending angularly the machine and pre. rably attached toisaid partition and to the front flange 3 by IlVGiJ 1.1 represents lugs 9 and also to the shell of the drum. Said charging blades. and, protect ng blades are so disposed, with relation to the parti- -\'lllL(l with a central opening 8 for inspection 7, that they extendoiitwardly therefrom in opposite directions angularly toof the arrow, and as the material is discharged into the peripheral ocket at the front through the charging c ate 4, it will be engaged successively by each of the charging blades 10 at their lowermost osition, carried around and upwardly, fa lingby gravity inwardly and downwardly to the interior of the mixer. Protectin blades 11, traveling in the same manner will tend the material being mixed away from opening 10 at the lowermost portion, preventing its escape therethrough to the front and providing a clear receiving space for the successive charge of new material.

The main interior peripheral wall of the drum is provided with any suitable mixing or carrying elements as one or more mixing blades 12 and one or more mixing plows 13, so disposed angularly across portions of the interior, extending outwardly from the walls and secured thereto, as to best"facilitate thorough admixture of the contents.

As shown in the drawings, I have employed but one mixing blade 12 and one mixing plow 13, arranged substantially opposite each other, but it will be understood that the number and arrangement of these elements may be varied to suit different conditions of use. 'and that their depth, anguhirity, or other features may be changed or modified as desired.

For the purposev of discharging the mixed contents tronrtiipe to time, I provide one or more dischargc gates 14 adapted to open and close a dischargeopening through head (3, two such gates being preferably employed as shown in the drawings. Said gates are hinged upon a supporting cross bar 15 from which theyfextend outwardly angularly toward and bear against head 6 in normal.

closed position, (Fig. 1) so that in the rotation of the machine the material will fall against the inner side of the'gate and be thrown backwardly into the interior, thus facilitating the mixing operation;

Gates-14 are adapted to be opened or closed from either end of the machine during its rotation, avoiding the necessity of stopping, by means of longitudinal rods.

16, 16, extending through rear head 6 and through the front cross bar 17 respectively, and provided with terminal grips 18, 19, one ateach end at front and back. Pivotally mounted at 20, 20, to said rods 16, 16', are links 21, 21, pivotally mounted at their outcr'ends at 22, to the extended stems 23,

23, or other suitable portions of gates 14:

Links 21 are preferably conii'ected by spring 24, tending to hold the ''gates normally closed, or normally open.

The gates are opened by pushing in rear grip 19, or pulling front grip 18, drawin the gates backwardly on their hinges an the front edges of mixing blade 12 and plow 13 respectively are preferably so located' that a portion will receive and support the edge or a part of the gate when opened and the material will be directed toward the discharge gate and opening by the mixing blades, as clearly shown in Fig. 4; The hinge 15 of each ate 14 is located adjacent to the inner en of the inclined gate blade or chute b forming part of the head (3 surrounding thedischarge opening, so that when opened the gate 14 will deliver material from blade 12 t0 the said gate blade orchute, by which it is discharged or any suitable receiving receptacle, after which the gates may be readily closed and the operation continued.

The drum is rotated by any suitable means, as a driving pinion or pinions 25, engaging a peripheral rack or racks 26 surrounding thev drum. Said racks may be separate or may form,, a portion of the surrounding supporting band 27 carried'on rollers 28 of the supporting framework, as will be readily understood.

In Figs. 7 and 8 I have shown a modified construction in which the separate chargin" blades and protecting blades are embodied in series of single blades, 10 angular-1y disposed i'r'round the front innerportion of drum 2 in a closely consecutive adjacent series. As shown the terminal corner of each of said blades. 10 extends beyond the body portion of the next adjacent blade,

29 for clearance of the enteringmaterial.

The blades in such construction are somewhat wider than the singly acting blades, extending inwardly toward the center and for the purpose of bracing the inner edges oi the blades and providing a bearing for thegate operating rods, one or more longitudmal cross bars 17 are attached in) the inner edges of the blades as shown. By this construction, the material will'bereceived within the front endoi :the shell back of the flange 3' and will be automatically carried around and deliveredinto the interior from which it can passoutwardlydue to the construction and arrangement of the series of blades.-

In Figs t) and 10, the drum 2 is provided with a diametrically enlarged annular re-- tended head 31, a surrounding pocket drum ceiving pocket 30 formed by radially ex- 32 and a front retaining flange 3", .a8

clearly shown in Fig. 10'. The charging blades10" and the protecting blades 11" 'cipnl figures of the drawings, except that blades 10" extend outwardly beyond the main drum diameter to the annular walls of the extended drum 32, thereby crossing the area of the pocket 30 radially at inter vals. The advai'itage of this construction is that the ingredients may be received at a still further point from the center of the drum, lower than in the construction cmploying a uniformly straight drum, thereby rendering it possible to locate the machine even below the level of any ordinary plat, form, its operation being substantially the same as that already described.

The operation of the invention will be understood from the foregoing description. The discharge doors are normally closed, the material is charged into the machine as has been described, at the lowermost portion of its receiving pocket, passing inwardly and undergoing the mixing process, being discharged from time to time as needed or when thoroughly mixed. The operation of the machine isrendered comparatively easy by the avoidance of any necessity for carry-- ing the material. up to a raised receiving chute, the machine itself operating to automatically receive the material at practically the ground level, and into its interior.

7 The advantages of the invention will be readily appreciated by all those familiar with this class of apparatus. The invention is comparatively simple in construction, cheap and not liable to get out of order, and will operate continuously without attention.

Having described the invention, what I claim is 1., A concrete mixer of the rotatable drum type having interior mixing elements incorporated with its shell and provided with a discharge chute at one end, and a pivotally mounted discharge gate of the swinging door type mounted within and revoluble with the drum and adapted in open posi-' tion to receive mixed material directly from one of said mixing elements and deliver it to the chute and in closed position to deflect the material backwardly into the drum. A concrete mixer of the rotatable drum type having a discharge chute, a discharge gate of the swinging door type pivotally mounted within the drum adjacent to the chute, and an interior radially arranged blade secured to the inner side of the drum near its discharging end and extending into U the path of the discharge gate. I

3. .A. concrete mixer of the rotatable drum type having an interior spirally disposed blade secured to the inner side of. the drum, a discharge chute leading outwardly through one end of the drum, :1. pivotally mounted discharge gate mounted within the drum adjawnt to said blade and chute, and spring controlled operating mechanism therefor adapted to penwand holdthe gate against {the termina of said blade and provide a bridge therefrom to the chute, and to close and'hold the gate over the chute to deflect the material backwardly into the drum.

4:. A concrete mixer consisting of a rota table drum having means to introduce the material therelnto, a rear wall having an outlet opening and a surrounding framing,

a discharge gate pivotally mounted within and revolnble with the drum and covering said opening, and an operating handle for said gate extending longitudiimlly through a portion of the machine, substantially as set forth.

5. A concrete mixer consisting of a rotatable drum having means to introduce the malet opening, a discharge gate covering said opening, and an operating handle for said gate extending longitudinally through a portion of the machine, and provided with a springcontrolled link engaging the gate, substantially as set forth.

'terial thereinto, a rear wall having an out- (i. A concrete mixer consisting of a rotatable drum having means to introduce the material thereinto, a rear wall having an out-v let opening, a discharge gate pivotally mounted within and revoluble with the drum and covering said opening,'and an operating handle for said gate extending longitudinally through a portion of the machine, and provided with means engaging the gate and hand-grips at each end, substantially as set forth.

7. A concrete mixer consisting of a rotatable drum having means to introduce the ma tcrial thereinto, a rear wall having an outlet opening, a-discharge gate covering said opening, actuating means for said gate pro vided with an operating handle, and spring mechanism. connected therewith for holding the gate either open or closed.

8. In a mixer, the combination with a revoluble drum having a closing head provided with a discharge opening, a door adapted to close said opening, opening and closing mechanism for said door mounted to revolve with the drum, and a diagonally arranged blade leading towardthe discharge opening and having aterminal adapted to .act as an arresting stop for the door when stantially closing the same, and when in thisposition having its free edge adjacent to the end wall of the drum above the discharge opening, the gate being then inclined downward and inward, the pivot of the said gate being so disposed that the free edge of the gate moves into the drain when the gate is adjusted from the aforesaid diverting position.

10. In a machine for mixing concrete, the combination of a rotatable mixing drum having a feed opening at one end and a dis charge opening at the'other end, a delivery chute and an adjustable flat pivoted gate Within and revoluble with the drum arranged when adjusted to one position to set vertically above the inner end of the chute and substantially close the same, and when in this position having its free end adjacent to the end wall of the drum above the discharge opening, the gate being then inclined downward and inward.

In testimony whereof I aflix my signature in presence of two witnesses.

MATTHEW HOWARD REED.

Witnesses:

JOSEPH SIMPSON, L. YATES. 

